N, K = map(int, input().split())
D = 20
A = [1] * D
dig = 1
for i in range(1, D):
    A[i] = A[i-1] * (1+(N//dig)%10)
    dig *= 10
ans = 0
for i in range(D-1, -1, -1):
    k = (K+A[i]-1)//A[i]
    ans += (k-1) * dig
    dig //= 10
    K -= A[i] * (k-1)
print(ans)